Abstract
Quantum systems habitually leak information, limiting their usefulness for practical applications. By optimally reversing the leak, this information loss has been reduced to a trickle in the solid state. If electron spins in solid materials are to be exploited in quantum computers, there is a need to minimize the quantum 'noise' that inevitably accompanies the interaction of the spins with their environment. Experiments in single crystals of malonic acid undergoing pulsed electron paramagnetic resonance now show how this can be achieved. The use of external pulses to induce the electron spins to 'flip' an optimal number of times causes their noisy interaction with the environment to be averaged towards zero, and the timescale over which spin coherence is maintained is markedly increased — from 0.04 to 30 microseconds in the system studied.
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